use std::cmp::Ordering;
use std::io;
use rand::Rng;

fn main() {
    println!("guess game start !!!");
    
    let secret_number = rand::rng().random_range(1..=100);
    loop {
        let mut guess = String::new();
        println!("please input a number to guess");
        io::stdin().read_line(&mut guess).expect("Failed to read line");
        let guess:u32 = match guess.trim().parse() {
            Ok(num) => num,
            Err(_) => { println!("Please type a number!"); continue; },
        };
        match guess.cmp(&secret_number) {
            Ordering::Less => println!("Too small!"),
            Ordering::Greater => println!("Too big!"),
            Ordering::Equal => {
                println!("You win!");
                break;
            },
        }
    }
}
